[Solved] Trouble with finding a substring in a string [closed]

by 


    Set<String> words = new HashSet<>();
    String str = "Java Ruby PHP.  Java is good. PHP please looks at Java";
    Matcher mat = Pattern.compile("\\b(\\w+)(?=\\b.*\\1)").matcher(str);
    while(mat.find()){
        words.add(mat.group(1));
    }
    System.out.println(words);

Also you can just split string by words and calculate count using Map. And then filter words with count > 1.

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solved Trouble with finding a substring in a string [closed]